HIP 41378
Star in the constellation Cancer
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HIP 41378 is a star located 346 light-years away in the constellation of Cancer. The star has an apparent magnitude of 8.92. This F-type main sequence dwarf has a mass of 1.245 M☉[6] and a radius of 1.299 R☉.[7] It has a surface temperature of about 6,371 K.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 08h 26m 27.84909s[2] |
| Declination | +10° 04′ 49.3342″[2] |
| Apparent magnitude (V) | 8.92[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[2] |
| Spectral type | F8[4] |
| Astrometry | |
| Radial velocity (Rv) | 50.42±0.37[5] km/s |
| Proper motion (μ) | RA: −48.002(20) mas/yr[2] Dec.: 0.062(15) mas/yr[2] |
| Parallax (π) | 9.4360±0.0208 mas[2] |
| Distance | 345.7 ± 0.8 ly (106.0 ± 0.2 pc) |
| Absolute magnitude (MV) | +3.65[1] |
| Details | |
| Mass | 1.245+0.037 −0.043[6] M☉ |
| Radius | 1.299±0.002[7] R☉ |
| Luminosity | 2.44[2] L☉ |
| Surface gravity (log g) | 4.32±0.02[6] cgs |
| Temperature | 6,371±65 K |
| Metallicity [Fe/H] | 0.046±0.044[6] dex |
| Rotation | 7.8±1.0 d[7] |
| Rotational velocity (v sin i) | 7.5±0.5[6] km/s |
| Age | 1.8+0.7 −0.6[6] Gyr |
| Other designations | |
| AG+10 1097, BD+10 1799, HIP 41378, SAO 97816, PPM 125260, K2-93, EPIC 211311380, TOI-4304, TIC 366443426, TYC 800-1325-1, YZ 10 3402[8] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Planetary system
In 2016, the K2 Kepler mission discovered five planets around HIP 41378, with sizes ranging from 2 times the size of Earth to the size of Jupiter, out to about 1 AU for the outermost planet.[9] The semi-major axes were not known until K2 Haute-Provence Observatory radial velocity data was obtained in 2019. Also, a sixth non-transiting planet, HIP 41378 g, was discovered, along with speculation that additional planets may exist between HIP 41378 g and HIP 41378 d. The planet HIP 41378 f was also found to likely have optically-thick rings or a highly extended atmosphere.[10][11]
The stellar rotation of HIP 41378 appears to be misaligned relative to the orbit of HIP 41378 f, and thus likely the other planets' orbits as well.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 9.06+1.41 −0.51 M🜨 |
0.1303±0.0013 | 15.571893+68 −53 |
0.0213+0.0022 −0.0099 |
88.816+0.065 −0.061° |
2.595±0.036 R🜨 |
| c | 6.53+1.33 −0.42 M🜨 |
0.2093±0.0022 | 31.70838+39 −41 |
0.0678+0.0078 −0.0097 |
88.462±0.015° | 2.727±0.06 R🜨 |
| g | 6.81+1.14 −0.98 M🜨 |
— | 64.067+0.026 −0.067 |
0.010+0.031 −0.010 |
95+1 −10° |
— |
| d | <4.6 M🜨 | 0.88±0.01 | 278.3618±0.0005 | 0.06±0.06 | 89.80±0.02° | 3.54±0.06 R🜨 |
| e | 12±5 M🜨 | 1.06±0.03 | 369±10 | 0.14±0.09 | 89.84±0.07° | 4.92±0.09 R🜨 |
| f | 12±3 M🜨 | 1.37±0.02 | 542.07975±0.00014 | 0 | 89.971±0.01° | 9.2±0.1 R🜨 |
